diff --git a/Home.md b/Home.md
index c787bab..f3e8592 100644
--- a/Home.md
+++ b/Home.md
@@ -70,7 +70,7 @@ Position | Meaning
 30 | Certified Mail: `1` if true, otherwise empty
 31 | Registered Mail: `1` if true, otherwise empty
 32 | Registered Mail declared value, USD
-33 | Return Receipt Requested: `1` if true, otherwise empty
+33 | Return Receipt Requested: `1` for paper, `2` for electronic, `3` for both, otherwise empty
 34 | Special rate eligibility: `M` for Media Mail, `L` for Library Mail, empty if not claiming eligibility
 35 | Insurance amount, USD
 36 | Signature services. 1: Signature required, 2: Adult signature required, 3: Restricted delivery signature, 4: Adult restricted signature, 5: Indirect signature.